Motor and a fuel pump using the same

• US 20070176511A1
• Filed: 01/24/2007
• Published: 08/02/2007
• Est. Priority Date: 02/02/2006
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Nagata, Kiyoshi, Sakai, Hiromi
• Application Number:
  US11/656,935
• Publication Number:
  US 20070176511A1
• Time in Patent Office: Days
• US Class Current: 310/216.8
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 3/325 for windings on salient poles, such as claw-shaped poles
• CPC Class Codes: H02K 5/12 specially adapted for operating in liquid or gas combined with cooling arrangements H02K9/00

Abstract

A motor includes a stator core, insulators, coils and a rotor. The stator core includes a plurality of coil cores, which are circumferentially arranged, wherein each of the plurality of coil cores includes a tooth that radially extends, and an outer peripheral core that circumferentially extends at a radially outer side of the tooth. Each of the insulators covers a corresponding one of the plurality of coil cores, wherein a part of each of the insulator is provided radially outward of an imaginary straight line, which connects circumferential ends of an inner peripheral surface of the outer peripheral core. Each of the coils is formed at the insulator. The rotor is rotatably provided to an inner peripheral side of the stator core.

Claims

1. A motor comprising:

a stator core that includes a plurality of coil cores, which are circumferentially arranged, wherein each of the plurality of coil cores includes;

a tooth that radially extends; and

an outer peripheral core that circumferentially extends at a radially outer side of the tooth;

insulators, each of which covers a corresponding one of the plurality of coil cores, wherein a part of each of the insulator is provided radially outward of an imaginary straight line, which connects circumferential ends of an inner peripheral surface of the outer peripheral core;

coils, each of which is formed by winding a winding wire at an outer periphery of a corresponding one of the insulators, wherein a magnetic pole, which is circumferentially formed at a radially inner side of each of the plurality of coil cores, is switched when energization of a corresponding one of the coils is controlled; and

a rotor that is rotatably provided to an inner peripheral side of the stator core, wherein;

different magnetic poles are alternately arranged in a rotational direction on an outer peripheral surface of the rotor; and

the outer peripheral surface of the rotor faces the stator core.

2. The motor according to claim 1, wherein:

a tooth side of the inner peripheral surface of the outer peripheral core is positioned radially outward of the imaginary straight line; and

a tooth side of an outer peripheral core side of a coil winding surface of the insulator is positioned radially outward of the imaginary straight line.

3. The motor according to claim 2, wherein:

the tooth side of the outer peripheral core side of the coil winding surface is a flat surface that extends along the imaginary straight line.

4. A fuel pump comprising:

the motor according to claim 1; and

a pump that is driven by the motor, wherein the pump takes in fuel and increases pressure of the fuel.

5. A motor comprising:

a stator core that includes a plurality of coil cores, which are circumferentially arranged, wherein;

each of the plurality of coil cores includes;

a tooth that radially extends; and

an outer peripheral core that circumferentially extends at a radially outer side of the tooth; and

circumferential ends of an inner peripheral surface of the outer peripheral core are more tilted radially inwardly relative to an imaginary straight line that connects the circumferential ends of the inner peripheral surface of the outer peripheral core as the circumferential ends approach circumferentially adjacently arranged coil cores;

insulators, each of which covers a corresponding one of the plurality of coil cores, wherein an outer peripheral core side of a coil winding surface of each of the insulators extends generally along the imaginary straight line;

coils, each of which is wound on a corresponding one of the insulators; and

a rotor that is rotatably provided to an inner peripheral side of the stator core, wherein;

different magnetic poles are alternately arranged in a rotational direction on an outer peripheral surface of the rotor; and

the outer peripheral surface of the rotor faces the stator core.

6. The motor according to claim 5, wherein the imaginary straight line is positioned on an outer peripheral core side of the coil winding surface.

7. The motor according to claim 5, wherein:

α

is defined as a tilt angle, at which the circumferential ends of inner peripheral surface of the outer peripheral core are tilted radially inwardly relative to the imaginary straight line that connects the circumferential ends of the inner peripheral surfaces of the outer peripheral core as the circumferential ends approach circumferentially adjacently arranged coil cores;

when the coil cores are four coil cores, 40a°

≦

α

≦

50°

;

when the coil cores are six coil cores, 25°

≦

α

≦

35°

; and

when the coil cores are eight coil cores, 17.5°

≦

α

≦

27.5°

.

8. A fuel pump comprising:

the motor according to claim 5; and

a pump that is driven by the motor, wherein the pump takes in fuel and increases pressure of the fuel.

9. A motor comprising:

a stator core that includes a plurality of coil cores that are circumferentially arranged, wherein;

each of the plurality of coil cores includes;

a tooth that radially extends; and

an outer peripheral core that circumferentially extends at a radially outer side of the tooth; and

a tooth side of an inner peripheral surface of the outer peripheral core is recessed radially outwardly relative to an imaginary straight line that connects the circumferential ends of the inner peripheral surfaces of the outer peripheral core as the circumferential ends approach circumferentially adjacently arranged coil cores;

insulators, each of which covers a corresponding one of the plurality of coil cores, wherein an outer peripheral core side of a coil winding surface of each of the insulators extends generally along the imaginary straight line;

coils, each of which is wound on a corresponding one of the insulators; and

a rotor that is rotatably provided to an inner peripheral side of the stator core, wherein;

different magnetic poles are alternately arranged in a rotational direction on an outer peripheral surface of the rotor; and

the outer peripheral surface of the rotor faces the stator core.

10. A fuel pump comprising:

the motor according to claim 9; and

a pump that is driven by the motor, wherein the pump takes in fuel and increases pressure of the fuel.